Kasumi (香澄 Kasumi) is the ex-girlfriend of Taichi. They got together during a difficult time in Junior High School. Taichi had lost his passion for Karuta but Kasumi shared her love for him. As such they started dating. However this relationship did not last very long. After meeting Chihaya again in High School, and finding his passion for Karuta again, there was no place for Kasumi anymore. As such Taichi breaks up with her in Episode 17/Chapter 29 over the phone in a short, dry, exchange.
Kasumi is a slim woman with dark brown hair. She has also dark brown eyes. She has been seen casually dressed with some makeup put on.
She has gotten together with Taichi Mashima during Junior High School. But in High School Taichi broke up with her again for the sake of Karuta and his love for Chihaya Ayase. Her nickname for Taichi is "Ta-kun".
Kasumi has met Chihaya only shortly in Episode 7 / Chapter 7 at the train station. Kasumi was waiting for her boyfriend Taichi. When he and Chihaya arrived, she greeting Taichi while Chihaya all of a sudden spurted out a challenge to Taichi that if she wins the next tournament to get into Class A, Taichi had to open up a Karuta Club with her. Kasumi was a little stumbled by the strange women she never met and immediately asked Taichi who that was.
- Although Taichi spoke to her over the phone in Episode 1, her voice was not heard. She had no speaking lines and therefore not listed in the end credits.